Return to Oz is a 1985 fantasy adventure film directed and written by Walter Murch, an editor and sound designer, cowritten by Gill Dennis and produced by Paul Maslansky. It stars Nicol Williamson as the Nome King, Jean Marsh as Princess Mombi, Piper Laurie as Aunt Em, Matt Clark as Uncle Henry and introduces Fairuza Balk as Dorothy Gale. It is loosley based on L. Frank Baum's Oz novels, mainly The Marvelous Land of Oz (1904) and Ozma of Oz (1907), yet is set six months after the events of the first novel, The Wonderful Wizard of Oz (1900). It is also considered a semi-sequel to the 1939 MGM film, The Wizard of Oz.